Translation guide
The English word 'fiend' can refer to a demon, an evil person, an enthusiast, or an addict. This guide covers natural Japanese expressions for each meaning, from literal supernatural beings to casual slang for obsession.
Referring to a supernatural evil being, like a devil or demon.
The most common word for 'demon' or 'devil'. Used in both religious and fantasy contexts.
He was possessed by a fiend.
Often translated as 'ogre' or 'demon' in folklore. Can imply a fierce, monstrous being, sometimes used metaphorically for a cruel person.
He attacked with a fiendish look on his face.
A more literary or fantasy term for a malevolent god or powerful demon. Often used in games and fiction.
The fiend tried to destroy the world.
Describing a person who is extremely evil, cruel, or heartless.
Literally 'extremely evil person'. Strong term for a villain or criminal.
He is a cold-hearted fiend.
Means 'villain' or 'scoundrel'. Common in fiction and news for bad guys.
Literally 'demon beast'. Very strong, emotive word for a brutal, inhuman person. Often used in condemnation.
Someone who is extremely enthusiastic about a particular activity or thing, often used in compounds like 'fitness fiend'.
Suffix meaning 'fanatic' or 'mania'. Attach to a noun to describe someone obsessed with it. E.g., 映画狂 (movie fiend).
He's a fitness fiend.
Loanword 'mania'. Used similarly to '-fiend' for enthusiasts, e.g., ガジェットマニア (gadget fiend). Slightly less intense than 狂.
Originally 'geek' or 'nerd', but can be used for obsessive fans of specific hobbies. Can have negative connotations, so use carefully.
Someone addicted to a substance or activity, like 'drug fiend'.
Standard word for 'addict'. Can be used for drugs, alcohol, or even behavioral addictions like gambling.
He's a drug fiend.
Loanword 'junkie'. Slang, often for drug addicts but can be used metaphorically (e.g., adrenaline junkie).
Means 'addiction to ~'. Used to describe the condition rather than the person, but can be combined with の人 to mean 'fiend'. E.g., スマホ依存症の人 (smartphone fiend).
He's a total gaming fiend.
Avoid directly translating 'fiend' as 悪魔 when referring to a cruel person unless you want a supernatural nuance. Use 極悪人 or 悪党 for human villains.
He is a devil. (implies literal demon, not just a bad person)
狂 is the strongest and most negative, implying obsession. マニア is neutral and often positive for collectors/hobbyists. オタク can be derogatory depending on context, but is reclaimed by some communities.
その悪党は無実の人々を苦しめた。
That fiend tormented innocent people.
I can't forgive the acts of such a fiend.
She's a coffee fiend and tries different beans every day.
He's a train fiend and goes taking photos every day off.
Adrenaline fiends love dangerous sports.